<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>1.天气案例</title>
    <!--  引入Vue  -->
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <!--  准备好一个容器  -->
    <div id="root">
        <h2>今天的天气是{{info}}</h2>
        <!--     绑定事件的时候 @xxx=“yyy” yyy可以写一些简单的语句   -->
        <!--        <button @click="isHot = !isHot">切换</button>-->
        <button @click="changeWeather">切换</button>
    </div>
</body>

<script type="text/javascript">
    const vm = new Vue({
        el: '#root',
        data: {
            isHot: true
        },
        computed: {
            info() {
                return this.isHot ? '炎热' : '寒冷'
            }
        },
        methods: {
            changeWeather() {
                this.isHot = !this.isHot
            }
        }
    })
</script>
</html>